WO2017048004A1 - Caisson de support de structure offshore et procédé de pénétration dans le fond de l'océan utilisant ledit caisson de support - Google Patents

Caisson de support de structure offshore et procédé de pénétration dans le fond de l'océan utilisant ledit caisson de support Download PDF

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Publication number
WO2017048004A1
WO2017048004A1 PCT/KR2016/010231 KR2016010231W WO2017048004A1 WO 2017048004 A1 WO2017048004 A1 WO 2017048004A1 KR 2016010231 W KR2016010231 W KR 2016010231W WO 2017048004 A1 WO2017048004 A1 WO 2017048004A1
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WO
WIPO (PCT)
Prior art keywords
spud
hole
seabed
penetration
support
Prior art date
Application number
PCT/KR2016/010231
Other languages
English (en)
Korean (ko)
Inventor
박종식
이준모
류민철
주영석
샤짜드 호세인무하마드
제이슨 캐시디마크
후위시아
김영호
Original Assignee
대우조선해양 주식회사
더 유니버시티 오브 웨스턴 오스트레일리아
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 대우조선해양 주식회사, 더 유니버시티 오브 웨스턴 오스트레일리아 filed Critical 대우조선해양 주식회사
Priority to AU2016324439A priority Critical patent/AU2016324439A1/en
Priority to GB1806106.9A priority patent/GB2559286A/en
Publication of WO2017048004A1 publication Critical patent/WO2017048004A1/fr

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B17/02—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto
    • E02B17/021—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto with relative movement between supporting construction and platform
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B17/04—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction
    • E02B17/08—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B2017/0056—Platforms with supporting legs
    • E02B2017/0073—Details of sea bottom engaging footing
    • E02B2017/0078—Suction piles, suction cans

Definitions

  • the present invention relates to a spud can of an offshore structure, and more particularly, to be installed at the bottom of an offshore floating structure to reduce or prevent a punch through phenomenon that may occur during the penetration work of the seabed.
  • the present invention relates to a spud can of a structure and a subsea ground penetration method using the spud can.
  • Offshore structures such as jack-up rigs, are anchored to the seabed for drilling and storage of gas, crude oil, and the like. It is provided with a plurality of legs (Leg) to be installed, and a spud can (Spudcan) is installed in the lower portion of each leg to support the marine floating structure on the seabed ground.
  • Leg legs
  • Spudcan spud can
  • the jack-up league must be stably fixed to the seabed ground in order to stably perform drilling and other operations at sea, for this purpose, it is necessary for the spud can penetrate the seabed to a certain depth.
  • Spurd cans are installed at the lower end of the legs of the jackup rig so that the jackup rig is fixedly installed on the seabed ground so as to stably fix the bottom ground.
  • the spud can penetrates the seabed to a depth above a certain level to secure sufficient support, and then stops the penetration of the seabed and stably supports the jackup rig equipped with drilling and production equipment.
  • 1 is a graph for explaining the punch-through phenomenon that may occur during the subsea ground penetration operation of the jack-up league.
  • the vertical axis represents depth of penetration through which the jackup rig and the spud can penetrate the seabed
  • the horizontal axis represents the jackup league and spud cand received for the seabed in the process of invading the seabed. It means Penetration resistance.
  • Penetration resistance is affected by the strength of the seabed being infiltrated and the horizontal cross-sectional area of the infiltrating spud can. In other words, the greater the strength of the seabed and the larger the horizontal cross-sectional area of the spud can penetrating, the larger the penetration resistance.
  • the spud can, which has been progressing smoothly until passing through the first point, meets a point that becomes lower than the penetration resistance of the first point as it passes through the first point, and thus the spud can suddenly descends. This phenomenon is called punch through.
  • the spud can which has begun to experience the punch through phenomenon, loses its stability to the point having the same penetration resistance as the first point (the second point in FIG. 1) and continues to descend rapidly.
  • the spud can is stably descended again to reach the point (the third point of FIG. 1) originally intended to descend, thereby completing the penetration process.
  • an object of the present invention is a spud can of the marine structure that can reduce or eliminate the punch-through phenomenon that can occur during the installation operation of the undersea ground when the jack-up rig is fixed to the undersea ground and the seabed using the spud can It is to provide a ground intrusion method.
  • a spud can (Spudcan) provided in the jack-up rig, the support portion constituting the body of the spud can is provided at the bottom of the jack-up rig; And a through hole penetrating the support part in an up and down direction so that penetration resistance generated when the spud can penetrates the seabed is reduced.
  • the horizontal cross section of the support may be circular.
  • the through hole includes an upper through hole and a lower through hole, wherein a boundary of the upper through hole is formed by an upper inner circumferential surface, and a boundary of the lower through hole is formed by a horizontal cross section of the support part.
  • the shape and the area of the support may be formed by the lower inner peripheral surface is formed to be enlarged as the height of the support is lower, the horizontal cross section of the support is formed.
  • the lower end of the support portion may further include a tip of the cone shape pointed downward.
  • the through hole formed by the horizontal cross section of the support may have a circular shape.
  • the through hole formed by the horizontal cross section of the support part may have a shape in which two circular arcs having the same center and center angle and different radii are connected.
  • the through hole may be plural.
  • the support has a truncated cone shape, and the inclination of the cone of the tip may be greater than the inclination of the truncated cone of the support.
  • the through hole may penetrate the support part in a vertical direction.
  • the spud cans in the subsea ground penetration method for supporting the jack-up league in the underwater ground by using the spud cans provided in the jack-up rig, the spud cans as the jack-up league descends Discharging the soil of the penetrating ground into the upper portion of the spud can through a through hole formed in a support part forming a body of the spud can provided at the bottom of the jackup rig; Undersea ground penetration method using the spud cans of the offshore structure including the step of the soil inside the through hole is not discharged to the top of the spud can by the pressure of the soil discharged to the top of the spud cans through the through hole. This is provided.
  • the seabed penetration method using the spud can of the marine structure may further comprise the step of terminating the spud can.
  • the punch-through phenomenon generated when the jack-up rig is fixedly installed on the seabed can be significantly reduced or eliminated, so that the stability of the jack-up rig in the seabed penetration process is greatly improved.
  • 1 is a graphical representation of a punch through phenomenon that may occur during subsea ground penetration operations of a jack up rig.
  • FIG. 2 is a plan view showing the spud can of the offshore structure according to the first embodiment of the present invention as viewed from above.
  • FIG. 2 is a plan view showing the spud can of the offshore structure according to the first embodiment of the present invention as viewed from above.
  • FIG 3 is a side view showing a side view of the spud can of the marine structure according to the first embodiment of the present invention.
  • FIG. 4 is a vertical cross-sectional view showing a state in which the spud can of the marine structure according to the first embodiment of the present invention is cut vertically.
  • FIG. 5 is a plan view illustrating a spud can of an offshore structure according to a second embodiment of the present invention as viewed from above.
  • FIG. 5 is a plan view illustrating a spud can of an offshore structure according to a second embodiment of the present invention as viewed from above.
  • FIG. 6 is a side view showing a side view of the spud can of the offshore structure according to the second embodiment of the present invention.
  • FIG. 7 is a vertical cross-sectional view showing a state in which the spud can of the marine structure according to the second embodiment of the present invention is cut vertically.
  • FIG. 8 is a graph illustrating a comparison of penetration resistance according to penetration depth when a spud can of an offshore structure according to the present invention is applied and when a spud can of a conventional offshore structure is applied.
  • FIG. 2 is a plan view showing the spud can of the offshore structure according to the first embodiment of the present invention from above
  • FIG. 3 is a plan view of the spud can of the offshore structure according to the first embodiment of the present invention from the side
  • 4 is a vertical cross-sectional view showing a vertical cut of the spud can of the offshore structure according to the first embodiment of the present invention.
  • a spud can 1 of an offshore structure includes a support 10 constituting a body of the spud can 1; And a tip portion 20 provided at a lower end of the support portion 10 and pointed downward.
  • Tip portion 20 may have a conical shape. As illustrated in FIGS. 2 to 4, the tip portion 20 may be formed at the lower center of the support portion 10. As described above, the spud can (1) is a configuration provided at the bottom of the jack-up rig, and serves to penetrate the seabed ground.
  • the lower portion of the support 10 may have a cut cone shape.
  • the inclination of the cut cone of the lower portion of the support portion 10 and the inclination of the tip portion 20 in the case of a cone shape may be different from each other.
  • the slope of the cone of the tip portion 20 may be greater than the slope of the cut cone of the lower portion of the support 10.
  • the support part 10 constituting the body of the spud can 1 is supplied with a driving force from offshore structures such as jack-up rig during the penetration process of the seabed ground, and performs the penetration of the seabed ground, and after the penetration of the seabed ground is completed It is fixed to the ground to support offshore structures such as jack-up leagues.
  • the support part 10 may have a plate shape.
  • the shape of the support part 10 as viewed from above, and the horizontal cross section of the support part 10 may be circular.
  • the tip portion 20 provided at the bottom of the support portion 10 may allow the subsea ground penetration process of the spud can 1 to occur more efficiently. That is, when the support portion 10 has a plate shape, the penetration resistance may increase and penetration of the sea bed may not occur smoothly. Thus, by providing the tip portion 20 which is pointed downward, penetration of the sea bed may be performed. This can be done more easily.
  • the tip portion 20 may serve as a wedge so that the spud can (1) can be firmly fixed to the seabed ground.
  • the through hole 100 is formed in the support portion 10 of the spud can of the offshore structure according to the first embodiment of the present invention.
  • the through hole 100 is formed to penetrate the support 10 in the vertical direction.
  • the through hole 100 may be formed to penetrate the support part 10 in the vertical direction.
  • the through hole 100 may be circular.
  • the through-hole 100 may be a plurality, as shown in Figure 2, the through-hole 100 may be formed symmetrically up, down, left and right.
  • Penetration resistance generated when the spud can penetrates the sea bed is proportional to the stiffness of the sea bed and the horizontal cross-sectional area of the spud can. Therefore, when the through hole 100 is present as in the first embodiment of the present invention, the lateral cross-sectional area (horizontal cross-sectional area) of the spud can is reduced, thereby reducing the penetration resistance.
  • the effect of the present invention will be described.
  • the graph shown in FIG. the effect of reducing the penetration resistance due to the present invention can be large in the initial penetration stage of the subsea ground where a punch through phenomenon occurs.
  • the first point of FIG. 1 moves to the left side
  • the second point of FIG. 1 also moves to the left upper side. Therefore, the second area where the punch through phenomenon occurs can be reduced or eliminated.
  • the soil of the seabed ground through which the spud can penetrate is discharged to the upper portion of the spud can through the through hole (100).
  • the soil of the seabed under which the spud can penetrates is pushed out to the outside of the spud can and discharged to the top of the spud can.
  • the soil of the sea bed is not properly pushed to the outside of the spud can, so that the penetration resistance is increased, and thus the penetration of the sea bed is not smoothly performed.
  • the soil of the seabed can be discharged to the upper portion of the spud can through the through hole 100, so that the penetration of the seabed is made smoothly. Can be.
  • the spud can is fixed to the sea bed to support the marine structure (jack-up jig), in this case, unlike the penetration process of the sea bed, sufficient penetration resistance must be secured. That is, in order to penetrate the undersea ground without a punch through phenomenon occurring very rarely or not, the penetration resistance must be small. However, the penetration resistance must be large enough to stably support the floating structure.
  • the through-hole 100 formed in the spud can of the present invention is filled with earth and sand is filled in the through-hole 100 by the pressure of the upper and lower spud cans discharged from the spud can Will not be,
  • the through hole 100 includes an upper through hole 102 forming an upper portion of the through hole 100, and a lower portion forming a lower portion of the through hole 100.
  • the through hole 104 may be included.
  • the surface forming the upper through hole 102 is the upper inner circumferential surface 112 and the lower through hole.
  • the surface forming 104 is the lower inner circumferential surface 114.
  • the upper inner circumferential surface 112 has a shape and an area of the upper through hole 102 formed by the horizontal cross section of the supporting portion 10 in relation to the height of the supporting portion 10 on which the horizontal cross section of the supporting portion 10 is formed.
  • the lower inner circumferential surface 114 may have a shape and an area of the lower through hole 104 formed by the horizontal cross section of the supporting portion 10. It may be formed to enlarge as the height of the portion 10 is lowered.
  • the upper inner circumferential surface 112 has a constant size (diameter) of the upper through hole 102, the upper and lower portions of the upper inner circumferential surface 112 are formed identically, while the lower inner circumferential surface 114 is lowered. Since the size (diameter) of the through hole 104 is not constant, the lower portion of the lower inner circumferential surface 114 is formed in a shape that is relatively larger than the upper portion.
  • the penetration resistance decreases during the penetration process of the sea bed, so that penetration of the sea bed can be relatively easy.
  • the penetration resistance caused by the penetration process of the seabed can be further reduced. It can be minimized.
  • FIG. 5 is a plan view showing the spud can of the offshore structure according to the second embodiment of the present invention from above
  • FIG. 6 is a plan view of the spud can of the offshore structure according to the second embodiment of the present invention from the side
  • FIG. 7 is a vertical cross-sectional view illustrating a vertical cut of a spud can of an offshore structure according to a second embodiment of the present invention.
  • the spud can of the offshore structure according to the second embodiment of the present invention according to FIGS. 5 to 7 is similar to the spud can of the offshore structure according to the first embodiment of the present invention.
  • the through hole 200 may be formed to penetrate in the up and down direction of the support part 10.
  • the through hole 200 moves the support part 10 in the vertical direction. It may be formed to penetrate through.
  • the through hole 200 or the support part 10 is cut in the horizontal direction when the support part 10 of the spud can of the marine structure according to the second embodiment of the present invention is viewed from above.
  • the through hole 200 of the cross section may have a shape in which two circular arcs having the same center and central angle and different radii are connected.
  • the centers of two circular arcs having the same center angle and different radii may be the same as the center of the support part 10 when the support part 10 has a circular plate shape.
  • the spud can of the offshore structure is the support portion 10 forming the body of the spud can, the tip portion 20 formed on the lower end of the support portion 10, and the support portion 10 It comprises a ring portion 220 surrounding ().
  • the lower portion of the support 10 may have a cut cone shape, and the tip portion 20 may have a cone shape.
  • the inclination of the cut cone of the lower portion of the support portion 10 and the inclination of the tip portion 20 in the case of a cone shape may be different from each other.
  • the slope of the cone of the tip portion 20 may be greater than the slope of the cut cone of the lower portion of the support 10. If the spud can has such a shape, the lower part of the spud can (1) has an empty structure, so that the soil does not move to the outside of the spud can (200) through the seabed penetration of the spud can (200). ) Can be moved to the top of the spud can.
  • the soil of the seabed ground is moved to the top of the spud can through the through hole 200 of the spud can.
  • the empty structure of the lower part of the spud can of the marine structure according to the second embodiment of the present invention, all or most of the earth and sand of the seabed ground through which the spud can penetrate passes through the through hole 200, the strength of the seabed ground Even if relatively large, the soil of the seabed can be moved to the upper portion of the spud can through the through hole 200 to reduce the penetration resistance.
  • FIG. 8 is a graph illustrating a comparison of penetration resistance according to penetration depth when a spud can of an offshore structure according to the present invention is applied and when a spud can of a conventional offshore structure is applied.
  • the spud cans applied to the spud cans of the conventional offshore structures have no through holes. Therefore, the content described in FIG. 1 may be applied. That is, referring to the conventional spud can application graph (hereinafter, referred to as G1) with reference to Figure 8, in the process of intruding the seabed ground using the spud can, the penetration resistance increases as the penetration depth increases. However, since the strength of the seabed is not increasing constantly, this tendency is not constant and a section in which the penetration resistance decreases temporarily occurs.
  • the penetration depth at which the penetration resistance sharply decreases at G1 is illustrated as about 15 meters.
  • a punch through phenomenon occurs in which the spud can sink sharply because the strength of the seabed ground supporting the spud can is weak. This punch-through phenomenon occurs until the penetration resistance has a penetration depth with penetration resistance just before the punch-through phenomenon occurs.
  • such penetration depth is shown to be about 25 meters. Therefore, in G1, the punch through phenomenon is shown to occur in a section having a penetration depth of 15 meters to 25 meters.
  • these specific values are merely exemplary and may vary depending on the specific structure of the seabed under which the intrusion occurs.
  • the penetration resistance of the marine structure according to the present invention is further increased in a section having a penetration depth of about 15 meters or more.
  • the seabed penetration method using a spud can of the marine structure according to the present invention.
  • the spud cans reaching the top of the seabed begin to penetrate into the seabed.
  • the support portion 10 forming the body of the spud can body of the marine structure according to the present invention forms a through hole 100, the earth and sand forming the seabed ground as the spud can penetrates the seabed ground
  • the through hole 100 is discharged from the bottom of the spud can to the top of the spud can.
  • the penetration resistance increases according to the above-described principle, and the soil inside the through hole 100 is discharged to the upper portion of the spud can by the pressure of the soil discharged to the upper portion of the spud can. Will not be.
  • the bottom ground penetration work of the spud cans is also terminated.
  • the moment when the soil inside the through hole is not discharged to the top of the spud can and the moment when the subsea ground penetration work is finished can be made at the same time.
  • the soil subsoil penetration work is terminated because the soil inside the through hole is not discharged to the top of the spud can.
  • the punch-through phenomenon generated when the jackup rig penetrates into the seabed can be significantly reduced or prevented, so that the stability of the jackup rig in the seabed penetration process is greatly improved.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Architecture (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Earth Drilling (AREA)
  • Underground Or Underwater Handling Of Building Materials (AREA)

Abstract

L'invention concerne un caisson de support d'une structure offshore et un procédé de pénétration dans le fond de l'océan utilisant ledit caisson de support. Selon la présente invention, dans le cas d'une plate-forme auto-élévatrice, afin de fixer la plate-forme auto-élévatrice au fond de l'océan, un caisson de support est utilisé pour pouvoir réduire ou éliminer des occurrences de perforation susceptibles de se produire pendant la pénétration du fond de l'océan.
PCT/KR2016/010231 2015-09-14 2016-09-12 Caisson de support de structure offshore et procédé de pénétration dans le fond de l'océan utilisant ledit caisson de support WO2017048004A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2016324439A AU2016324439A1 (en) 2015-09-14 2016-09-12 Spudcan of offshore structure and ocean floor penetrating method using said spudcan
GB1806106.9A GB2559286A (en) 2015-09-14 2016-09-12 Spudcan of offshore structure and ocean floor penetrating method using said spudcan

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2015-0129604 2015-09-14
KR1020150129604A KR101837098B1 (ko) 2015-09-14 2015-09-14 해상 부유물용 스퍼드캔

Publications (1)

Publication Number Publication Date
WO2017048004A1 true WO2017048004A1 (fr) 2017-03-23

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PCT/KR2016/010231 WO2017048004A1 (fr) 2015-09-14 2016-09-12 Caisson de support de structure offshore et procédé de pénétration dans le fond de l'océan utilisant ledit caisson de support

Country Status (4)

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KR (1) KR101837098B1 (fr)
AU (1) AU2016324439A1 (fr)
GB (1) GB2559286A (fr)
WO (1) WO2017048004A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102006696B1 (ko) 2017-11-28 2019-08-02 삼성중공업 주식회사 교체 가능한 구조의 스퍼드캔
KR102016315B1 (ko) 2017-12-08 2019-08-30 삼성중공업 주식회사 스퍼드캔구조물

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070059106A1 (en) * 2005-09-13 2007-03-15 Offshore Technology Development Pte Ltd Extraction of foundation in offshore platforms
US20090269144A1 (en) * 2005-09-13 2009-10-29 Offshore Technology Development Pte Ltd Extraction System For Removable Marine Footing
US20120230773A1 (en) * 2011-03-09 2012-09-13 Keppel Offshore & Marine Technology Centre Pte Ltd. Skirted Foundation For Penetrating Soft Material
KR20140005492A (ko) * 2012-07-04 2014-01-15 삼성중공업 주식회사 부유식 구조물의 지지레그 장치
KR101488290B1 (ko) * 2013-11-15 2015-02-02 대우조선해양 주식회사 잭업 리그용 스퍼드 장치

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101434580B1 (ko) * 2013-07-11 2014-08-27 삼성중공업 주식회사 하이브리드 잭업 드릴링 및 생산 장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070059106A1 (en) * 2005-09-13 2007-03-15 Offshore Technology Development Pte Ltd Extraction of foundation in offshore platforms
US20090269144A1 (en) * 2005-09-13 2009-10-29 Offshore Technology Development Pte Ltd Extraction System For Removable Marine Footing
US20120230773A1 (en) * 2011-03-09 2012-09-13 Keppel Offshore & Marine Technology Centre Pte Ltd. Skirted Foundation For Penetrating Soft Material
KR20140005492A (ko) * 2012-07-04 2014-01-15 삼성중공업 주식회사 부유식 구조물의 지지레그 장치
KR101488290B1 (ko) * 2013-11-15 2015-02-02 대우조선해양 주식회사 잭업 리그용 스퍼드 장치

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KR20170032514A (ko) 2017-03-23
KR101837098B1 (ko) 2018-03-12
GB2559286A (en) 2018-08-01
AU2016324439A1 (en) 2018-04-26
GB201806106D0 (en) 2018-05-30

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